A verb appearing as G. mal- “to chew” in the Gnomish Lexicon of the 1910s (GL/56), perhaps based on the early root ᴱ√MALA “crush” (QL/58).
Neo-Sindarin: The root became ᴹ√MBAL in The Etymologies of the 1930s (Ety/MBAL), whose Sindarin derivatives would start with bal- conflicting with later forms like S. bal- “✱to have [divine] power” (PE17/131). For purposes of Neo-Sindarin I would use ᴺS. nadh- “to chew, gnaw” from ᴹ√NYAD “gnaw” (Ety/NYAD).
A noun in the Gnomish Lexicon of the 1910s glossed “the (inside of the) mouth” (GL/56). It is probably based on mal- “chew”.